While the fish oil supplement companies will tell you otherwise, we’re going with the assessment of the American Academy of Dermatologists who summarized several studies evaluating the effect of fish oil on atopic dermatitis and psoriasis (basically, different dry skin conditions.)

In neither case did they find any correlation between fish oil intake and improvement in skin condition. You can read the entire 90 page report on atopic dermatitis here. We’re not saying you shouldn’t take fish oil supplements, it just doesn’t look like they have much direct effect on your skin. You’re better off using a good lotion.